nēsos

This is an ordinary geographic word, and most of the time it does ordinary work. Seven of its nine appearances sit inside travel accounts: Paul and Barnabas cross Cyprus from one end to the other, a storm-driven ship is warned that it must run aground on some island, the shipwrecked company learns afterward that the island is called Malta, and John writes as a man who is on the island called Patmos. In each case the word simply tells you where someone is standing.

Revelation puts the same plain word on a much larger canvas. Twice the seer watches every mountain and island shift out of place or flee outright. Islands and mountains get named together because they are the parts of the map that are supposed to stay put, so their flight is a picture of the settled world coming undone. The Greek Old Testament had long used this word for the Hebrew word for the coastlands (אִי), the far shores that hear about God from a distance, and that older picture stands behind these scenes.

Sea travel in the ancient Mediterranean ran island to island, so the word carries no drama of its own. Where a writer wants to stress how small a scrap of land is, a smaller relative does that job instead (νησίον): that is the word used of the islet the ship ran under for shelter in Acts 27:16. Whatever weight an island carries in these texts comes from what happens on it: a false prophet confronted, a shipwreck survived, a vision received.